Double-pionic fusion of nuclear systems and the "aBC" effect: Approaching a puzzle by exclusive and kinematically complete measurements

M. Bashkanov; C. Bargholtz; M. Berłowski; D. Bogoslawsky; H. Calén; H. Clement; L. Demiroers; E. Doroshkevich; D. Duniec; C. Ekström; K. Fransson; L. Geren; L. Gustafsson; B. Höistad; G. Ivanov; M. Jacewicz; E. Jiganov; T. Johansson; O. Khakimova; S. Keleta; I. Koch; F. Kren; S. Kullander; A. Kupść; K. Lindberg; P. Marciniewski; R. Meier; B. Morosov; C. Pauly; H. Pettersson; Y. Petukhov; A. Povtorejko; A. Pricking; R. J.M.Y. Ruber; K. Schönning; W. Scobel; B. Shwartz; T. Skorodko; V. Sopov; J. Stepaniak; P. E. Tegner; P. Thörngren-Engblom; V. Tikhomirov; A. Turowiecki; G. J. Wagner; M. Wolke; J. Zabierowski; I. Zartova; J. Złomanczuk

doi:10.1103/PhysRevLett.102.052301

Double-pionic fusion of nuclear systems and the "aBC" effect: Approaching a puzzle by exclusive and kinematically complete measurements

M. Bashkanov^*, C. Bargholtz, M. Berłowski, D. Bogoslawsky, H. Calén, H. Clement, L. Demiroers, E. Doroshkevich, D. Duniec, C. Ekström, K. Fransson, L. Geren, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, S. KeletaI. Koch, F. Kren, S. Kullander, A. Kupść, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Pettersson, Y. Petukhov, A. Povtorejko, A. Pricking, R. J.M.Y. Ruber, K. Schönning, W. Scobel, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak, P. E. Tegner, P. Thörngren-Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, J. Zabierowski, I. Zartova, J. Złomanczuk

^*Corresponding author for this work

Physics

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Abstract

The ABC effect-a puzzling low-mass enhancement in the ππ invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn→dπ0π0 at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (ππ)I=L=0 channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a ΔΔ system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

Original language	English
Article number	052301
Journal	Physical Review Letters
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.102.052301
Publication status	Published - 2 Feb 2009

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Bashkanov, M., Bargholtz, C., Berłowski, M., Bogoslawsky, D., Calén, H., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Fransson, K., Geren, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., ... Złomanczuk, J. (2009). Double-pionic fusion of nuclear systems and the "aBC" effect: Approaching a puzzle by exclusive and kinematically complete measurements. Physical Review Letters, 102(5), Article 052301. https://doi.org/10.1103/PhysRevLett.102.052301

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title = "Double-pionic fusion of nuclear systems and the {"}aBC{"} effect: Approaching a puzzle by exclusive and kinematically complete measurements",

abstract = "The ABC effect-a puzzling low-mass enhancement in the ππ invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn→dπ0π0 at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (ππ)I=L=0 channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a ΔΔ system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.",

author = "M. Bashkanov and C. Bargholtz and M. Ber{\l}owski and D. Bogoslawsky and H. Cal{\'e}n and H. Clement and L. Demiroers and E. Doroshkevich and D. Duniec and C. Ekstr{\"o}m and K. Fransson and L. Geren and L. Gustafsson and B. H{\"o}istad and G. Ivanov and M. Jacewicz and E. Jiganov and T. Johansson and O. Khakimova and S. Keleta and I. Koch and F. Kren and S. Kullander and A. Kup{\'s}{\'c} and K. Lindberg and P. Marciniewski and R. Meier and B. Morosov and C. Pauly and H. Pettersson and Y. Petukhov and A. Povtorejko and A. Pricking and Ruber, {R. J.M.Y.} and K. Sch{\"o}nning and W. Scobel and B. Shwartz and T. Skorodko and V. Sopov and J. Stepaniak and Tegner, {P. E.} and P. Th{\"o}rngren-Engblom and V. Tikhomirov and A. Turowiecki and Wagner, {G. J.} and M. Wolke and J. Zabierowski and I. Zartova and J. Z{\l}omanczuk",

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month = feb,

day = "2",

doi = "10.1103/PhysRevLett.102.052301",

language = "English",

volume = "102",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Bashkanov, M, Bargholtz, C, Berłowski, M, Bogoslawsky, D, Calén, H, Clement, H, Demiroers, L, Doroshkevich, E, Duniec, D, Ekström, C, Fransson, K, Geren, L, Gustafsson, L, Höistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Keleta, S, Koch, I, Kren, F, Kullander, S, Kupść, A, Lindberg, K, Marciniewski, P, Meier, R, Morosov, B, Pauly, C, Pettersson, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, RJMY, Schönning, K, Scobel, W, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, PE, Thörngren-Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, GJ, Wolke, M, Zabierowski, J, Zartova, I & Złomanczuk, J 2009, 'Double-pionic fusion of nuclear systems and the "aBC" effect: Approaching a puzzle by exclusive and kinematically complete measurements', Physical Review Letters, vol. 102, no. 5, 052301. https://doi.org/10.1103/PhysRevLett.102.052301

TY - JOUR

T1 - Double-pionic fusion of nuclear systems and the "aBC" effect

T2 - Approaching a puzzle by exclusive and kinematically complete measurements

AU - Bashkanov, M.

AU - Bargholtz, C.

AU - Berłowski, M.

AU - Bogoslawsky, D.

AU - Calén, H.

AU - Clement, H.

AU - Demiroers, L.

AU - Doroshkevich, E.

AU - Duniec, D.

AU - Ekström, C.

AU - Fransson, K.

AU - Geren, L.

AU - Gustafsson, L.

AU - Höistad, B.

AU - Ivanov, G.

AU - Jacewicz, M.

AU - Jiganov, E.

AU - Johansson, T.

AU - Khakimova, O.

AU - Keleta, S.

AU - Koch, I.

AU - Kren, F.

AU - Kullander, S.

AU - Kupść, A.

AU - Lindberg, K.

AU - Marciniewski, P.

AU - Meier, R.

AU - Morosov, B.

AU - Pauly, C.

AU - Pettersson, H.

AU - Petukhov, Y.

AU - Povtorejko, A.

AU - Pricking, A.

AU - Ruber, R. J.M.Y.

AU - Schönning, K.

AU - Scobel, W.

AU - Shwartz, B.

AU - Skorodko, T.

AU - Sopov, V.

AU - Stepaniak, J.

AU - Tegner, P. E.

AU - Thörngren-Engblom, P.

AU - Tikhomirov, V.

AU - Turowiecki, A.

AU - Wagner, G. J.

AU - Wolke, M.

AU - Zabierowski, J.

AU - Zartova, I.

AU - Złomanczuk, J.

PY - 2009/2/2

Y1 - 2009/2/2

N2 - The ABC effect-a puzzling low-mass enhancement in the ππ invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn→dπ0π0 at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (ππ)I=L=0 channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a ΔΔ system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

AB - The ABC effect-a puzzling low-mass enhancement in the ππ invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn→dπ0π0 at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (ππ)I=L=0 channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a ΔΔ system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

UR - http://www.scopus.com/inward/record.url?scp=60549105631&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.102.052301

DO - 10.1103/PhysRevLett.102.052301

M3 - Article

AN - SCOPUS:60549105631

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 052301

ER -

Double-pionic fusion of nuclear systems and the "aBC" effect: Approaching a puzzle by exclusive and kinematically complete measurements

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